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  1. respire

    BBS02 - 10S Cassette cogs eating freewheel spline & remedies

    Hi there, I was just unmounting my 10-speed cassette to do a mod recommended here to get better chain line with mid-drives. Then I saw my freewheel spline on my Novatech D882SB had been dented by the cogs of the casette: My front sprocket is a 42T, 11-42 for the cassette, my rim size...
  2. respire

    Error 07h on BBS02 - fried controller?

    Hi there, I recently had intermitent occurences on my BBS02 750W where my C965 display would indicate the error code « 07h » randomly in the middle of a ride. When this happened there would be no power output. After I had this happened 2-3 times in a week, it became a persistent issue and it...
  3. respire

    bluetooth BMS?

    For those who use the the BMS compatible with the Xiaoxiang app, have they successfully tried alternative apps? The reason I want another android app is that I find it too slow to startup as it asks me to change my GPS setting every single time. Shorza mentions in page 9 of this thread that...
  4. respire

    LEDs - are COB or SMBs offering the widest operational range in voltage and current?

    You all convinced me. I'm getting a DC-DC converter. Also I'll be getting these eagle-eye lights in white and in red with integrated turn signal. That is to say, half of the 12 4014 LEDs are powered with a different wire and shine amber. Now I'll need to wire a blinker of some kind to get the...
  5. respire

    LEDs - are COB or SMBs offering the widest operational range in voltage and current?

    Appreciating everyone's input, thanks. Still, I would love to know if people have information about the question I put as a topic title. Is it fair to guess that based on their architecture (no PCB, built on a sheet of aluminium), the COB will dissipate heat more efficiently, and then dissipate...
  6. respire

    LEDs - are COB or SMBs offering the widest operational range in voltage and current?

    I get you, however that'd be yet one more electronic component to protect from water, hide and pay for. If someone would demonstrates that these type of light won't light up at 10.5V or will blow after 10 hours of use at 14.5V, then I'd consider the converter, for sure :)
  7. respire

    LEDs - are COB or SMBs offering the widest operational range in voltage and current?

    It's time to put some lights onto my first e-bike project! My battery is 52V and it delivers in the range of 42-58V (roughly), and i'd like to be able to use four 12V LED in series without a DC/DC converter. However when the battery is full, the LED should still glow with only 42/4=10.5V and...
  8. respire

    yet another solderless DIY battery pack via NIB's

    I'm pondering using 20700 or 21700 cells instead of 18650. Perhaps someone can help me building a list of pros and cons? For info, my needs are 14S and ~20A of draw for a Bafang BBS02 and this will be my first battery build. Her's a start for the pros/cons: Presumed pros: 1. The wider cell...
  9. respire

    Bluetooth BMS and high voltage cutoff

    The battery builder is Paco from Cyclone Taiwan... I met him and I'm sure he knows his stuff, but I think the language barrier (his english//my chinese) is preventing us to communicate very effectively. Here's his last message after I asked him to adjust the voltage of the charger he'll provide...
  10. respire

    Bluetooth BMS and high voltage cutoff

    Thanks for the recommendations. They have an external potentiometer for voltage adjustment right? I've seen the product sheet and these charger seem to support a 90-300+ voltage range. I'm in Taiwan with 110/60Hz, do you think there will be noticable differences in terms of output current and...
  11. respire

    Bluetooth BMS and high voltage cutoff

    I'm having a battery built with a bluetooth BMS (this one) and would like to know if using it to limit high voltage to 4V per cell is a substitute for using a charger with a 80% or 90% cutoff. My (uneducated) assumption is that the charging voltage output on a 58.8V charger set to charge at 90%...
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